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Direct linkLynn, Richard – Intelligence, 2009
Results of five studies show that during the second half of the twentieth century there were increases in the Development Quotients (DQs) of infants in the first two years of life. These gains were obtained for the Bayley Scales in the United States and Australia, and for the Griffiths Test in Britain. The average of 19 data points is a DQ gain of…
Descriptors: Intelligence Quotient, Preschool Children, Infants, Foreign Countries
